98 lines
2.7 KiB
Haskell
98 lines
2.7 KiB
Haskell
{- git-annex uuid-based logs
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-
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- This is used to store information about UUIDs in a way that can
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- be union merged.
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-
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- The old format looks like: "UUID[ INFO[ timestamp=foo]]"
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- The timestamp is last for backwards compatibility reasons,
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- and may not be present on very old log lines.
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-
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- New uuid based logs instead use the form: "timestamp UUID INFO"
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-
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- Copyright 2011-2019 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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{-# LANGUAGE OverloadedStrings, TupleSections #-}
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module Logs.UUIDBased (
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Log,
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LogEntry(..),
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VectorClock,
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currentVectorClock,
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parseLogOld,
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parseLogNew,
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parseLogOldWithUUID,
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buildLogOld,
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buildLogNew,
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changeLog,
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addLog,
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simpleMap,
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) where
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import qualified Data.Map as M
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import Common
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import Types.UUID
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import Annex.VectorClock
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import Logs.MapLog
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import Logs.Line
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import qualified Data.ByteString as S
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import qualified Data.ByteString.Lazy as L
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import qualified Data.Attoparsec.ByteString as A
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import qualified Data.Attoparsec.ByteString.Lazy as AL
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import qualified Data.Attoparsec.ByteString.Char8 as A8
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import Data.ByteString.Builder
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import qualified Data.DList as D
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type Log v = MapLog UUID v
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buildLogOld :: (v -> Builder) -> Log v -> Builder
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buildLogOld builder = mconcat . map genline . M.toList
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where
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genline (u, LogEntry c@(VectorClock {}) v) =
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buildUUID u <> sp <> builder v <> sp
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<> byteString "timestamp="
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<> buildVectorClock c
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<> nl
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genline (u, LogEntry Unknown v) =
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buildUUID u <> sp <> builder v <> nl
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sp = charUtf8 ' '
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nl = charUtf8 '\n'
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parseLogOld :: A.Parser a -> L.ByteString -> Log a
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parseLogOld = parseLogOldWithUUID . const
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parseLogOldWithUUID :: (UUID -> A.Parser a) -> L.ByteString -> Log a
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parseLogOldWithUUID parser = fromMaybe M.empty . AL.maybeResult
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. AL.parse (logParserOld parser)
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logParserOld :: (UUID -> A.Parser a) -> A.Parser (Log a)
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logParserOld parser = M.fromListWith best <$> parseLogLines go
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where
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go = do
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u <- toUUID <$> A8.takeWhile1 (/= ' ')
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(dl, ts) <- accumval D.empty
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v <- either fail return $ A.parseOnly (parser u <* A.endOfInput)
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(S.intercalate " " $ D.toList dl)
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return (u, LogEntry ts v)
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accumval dl =
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((dl,) <$> parsetimestamp)
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<|> (A8.char ' ' *> (A8.takeWhile (/= ' ')) >>= accumval . D.snoc dl)
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parsetimestamp =
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(A8.string " timestamp=" *> vectorClockParser <* A.endOfInput)
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<|> (const Unknown <$> A.endOfInput)
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buildLogNew :: (v -> Builder) -> Log v -> Builder
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buildLogNew = buildMapLog buildUUID
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parseLogNew :: A.Parser v -> L.ByteString -> Log v
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parseLogNew = parseMapLog (toUUID <$> A.takeByteString)
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changeLog :: CandidateVectorClock -> UUID -> v -> Log v -> Log v
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changeLog = changeMapLog
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addLog :: UUID -> LogEntry v -> Log v -> Log v
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addLog = addMapLog
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